Adds better ability to manage SnackbarModels

Material.Demo/MainWindow.axaml.cs

@@ -1,10 +1,13 @@
-using Avalonia;
+using System;
+using System.Collections.Generic;
+using Avalonia;
 using Avalonia.Controls; 
 using Avalonia.Controls.Primitives;
 using Avalonia.Input;
 using Avalonia.Interactivity;
 using Avalonia.Markup.Xaml;
 using Material.Styles;
+using Material.Styles.Models;
 
 namespace Material.Demo {
     public class MainWindow : Window {
@@ -67,13 +70,22 @@ private void TemplatedControl_OnTemplateApplied(object? sender, TemplateAppliedE
             SnackbarHost.Post("Welcome to demo of Material.Avalonia!");
         }
 
+        private List<SnackbarModel> helloSnackBars = new List<SnackbarModel>();
+
         private void HelloButtonMenuItem_OnClick(object? sender, RoutedEventArgs e)
         {
-            SnackbarHost.Post("Hello, user!");
+            var helloSnackBar = new SnackbarModel("Hello, user!", TimeSpan.Zero);
+            SnackbarHost.Post(helloSnackBar);
+            helloSnackBars.Add(helloSnackBar);
         }
 
         private void GoodbyeButtonMenuItem_OnClick(object? sender, RoutedEventArgs e)
         {
+            foreach (var snackbarModel in helloSnackBars)
+            {
+                SnackbarHost.Remove(snackbarModel);
+            }
+
             SnackbarHost.Post("See ya next time, user!");
         }
     }

Material.Styles/Models/SnackbarModel.cs

@@ -12,6 +12,12 @@ public SnackbarModel(object content, Orientation orientation = Orientation.Horiz
             //_button = button;
         }
 
+        public SnackbarModel(object content, TimeSpan duration, Orientation orientation = Orientation.Horizontal) : this(content, orientation)
+        {
+            _duration = duration;
+        }
+
+
         private object _content;
         public object Content => _content;
 
@@ -24,6 +30,7 @@ public SnackbarModel(object content, Orientation orientation = Orientation.Horiz
         private object _button;
         public object Button => _button;
 
+        // Setting duration to TimeSpan.Zero, will make it stay forever/til you manually delete it 
         private TimeSpan _duration = TimeSpan.FromSeconds(5);
         public TimeSpan Duration => _duration;
     }

Material.Styles/SnackbarHost.xaml.cs

@@ -127,30 +127,55 @@ public static void Post(SnackbarModel model, string targetHost = null)
             if (host is null)
                 throw new ArgumentNullException(nameof(targetHost), $"The target host named \"{targetHost}\" is not exist.");
 
-            ElapsedEventHandler onExpired = null;
-            onExpired = delegate(object sender, ElapsedEventArgs args)
+            // If duration is TimeSpan.Zero, dont expire it.
+            if (model.Duration != TimeSpan.Zero)
             {
-                if (sender is Timer timer)
+                ElapsedEventHandler onExpired = null;
+                onExpired = delegate(object sender, ElapsedEventArgs args)
                 {
-                    // Remove timer.
-                    timer.Stop();
-                    timer.Elapsed -= onExpired;
-                    timer.Dispose();
+                    if (sender is Timer timer)
+                    {
+                        // Remove timer.
+                        timer.Stop();
+                        timer.Elapsed -= onExpired;
+                        timer.Dispose();
 
-                    OnSnackbarDurationExpired(host, model);
-                }
-            };
-
-            var timer = new Timer(model.Duration.TotalMilliseconds);
-            timer.Elapsed += onExpired;
-            timer.Start();
+                        OnSnackbarDurationExpired(host, model);
+                    }
+                };
 
+                var timer = new Timer(model.Duration.TotalMilliseconds);
+                timer.Elapsed += onExpired;
+                timer.Start();
+            }
+
             Dispatcher.UIThread.Post(delegate
             {
                 host.SnackbarModels.Add(model);
             });
         }
 
+        /// <summary>
+        /// Removes a snackbar manually
+        /// </summary>
+        /// <param name="model">snackbar data model.</param>
+        /// <param name="targetHost">the snackbar host that you wanted to use.</param>
+        public static void Remove(SnackbarModel model, string targetHost = null)
+        {
+            if (targetHost is null)
+                targetHost = GetFirstHostName();
+
+            var host = GetHost(targetHost);
+
+            if (host is null)
+                throw new ArgumentNullException(nameof(targetHost), $"The target host named \"{targetHost}\" is not exist.");
+
+            Dispatcher.UIThread.Post(delegate
+            {
+                host.SnackbarModels.Remove(model);
+            });
+        }
+
         private static void OnSnackbarDurationExpired(SnackbarHost host, SnackbarModel model)
         {
             Dispatcher.UIThread.Post(delegate